If you start in an empty workspace, and then switch to a workspace with the market analyzer it seems to work. The workspace with the indicator in the Market Analyzer must be closed before attempting to do so.
Task Manager reports no significant CPU or Disk activity while it sits there. No amount of time makes it eventually enable.
I tested this with a clean version of NinjaTrader, using the latest release. The only custom code is a very simple indicator with AddDataSeries calls. See the attached code.
Playback was tested using "Historical" mode.
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